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Experimental Fluid Mechanics, Turbulence, Flow Induced Vibration and Noise, Shear Flows, Flow Control, Coherent Structures, Energy Systems

Turbulence research is of the greatest practical importance. Holmes, Lumely and Berkooz (1996) have suggested that ''turbulence is responsible for the vast majority of human energy consumption, in aircraft fuel, pipeline pumping charges, and so forth." However, despite its widespread relevance, the equation set describing turbulent flows is not closed and prediction of the phenomena associated with turbulence, such as drag and heat transfer, remains difficult. My research interests lie in extracting and manipulating the organized motions that exist in seemingly random turbulent flows. Understanding the role of these "coherent structures" is crucial for prediction and control of many quantities of engineering interest, like drag, heat-transfer mixing and noise production. Once understood the structures can be manipulated by active or passive means to produce desirable effects like drag reduction, heat-transfer enhancement, improved mixing or quieter vehicles.

• Hall, J.W., Hall, A.M , Pinier, J.T, and Glauser, M.N., "A Cross-Spectral Analysis of the Pressure in a Mach 0.85 Turbulent Jet," Submitted to AIAA Journal.
• Hall, J. W., and Ewing D., 2007, "The asymmetry of the large-scale structures in turbulent three-dimensional wall jets exiting long rectangular channels," Journal of Fluids Engineering . 129:929-941.
• Hall, J. W., and Ewing D., 2007, "Three-Dimensional Turbulent Wall Jets Issuing From Moderate Aspect-Ratio Rectangular Channels," AIAA Journal . 45(6): 1177-1186.
• Hall, J. W., and Ewing D., 2006, "On the dynamics of the large-scale structures in round impinging jets," Journal of Fluid Mechanics. 555:439-458.
• Hall, J. W., and Ewing D., 2005, "The development of the large-scale structures in round impinging jets exiting long pipes at two Reynolds numbers," Experiments in Fluids. 38(1):50-58.
• Hall, J. W., Ziada, S., and Weaver, D.S., 2003, "Vortex-shedding from single and tandem cylinders in the presence of applied sound," Journal of Fluids and Structures . 18(6):741-758.